I used to have a 300mm Nikon lens and if I would stand a couple feet away from my bamboo blind while it was closed (it had some little gaps), I could focus on a

I used to have a 300mm Nikon lens and if I would stand a couple feet away from my bamboo blind while it was closed (it had some little gaps), I could focus on an object about 100ft away on the other side and you could not see the blind... like it became invisible (I could not even see the object with my bar eyes).